Bug Day Results

I finally managed to scrounge up some time to hack on BrainDump again. Had a fairly productive day, fixing the following open tickets:

5 - Implement configuration system

14 - Due date column doesn't distinguish between years

12 - Add a "Due Today" date filter

I also made some internal changes including the long needed base subclass for Task and Project (called Actionable) as well as a new Actionable.state field which caches the state as defined by start_date, due_date, and completed. Lastly, overdue and upcoming tasks are now presented in red and yellow respectively, making it easier to identify urgent items. Pull down the latest git and try it out!